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1. A MIXER COMPRISING HOUSING MEANS IN THE FORM OF PARALLEL INTERSECTING CYLINDERS, AXIALLY ARRANGED PAIRS OF RADIALLY INTERENGAGING ROTATABLE MEMBERS MOUNTED ON SHAFTS, EXTENDING AXIALLY OF SAID CYLINDERS, FOR ROTATION THEREIN, EACH MEMBER IN CROSS SECTION EACH HAVING CONVEX FLANKS JOINED AT BOTH OUTER ENDS BY ARCUATE CRESTS FORMED ON RADII AT LEAST SUBSTANTIALLY EQUAL TO THE RADIUS OF THEIR ASSOCIATED CYLINDER, DRIVE MEANS FOR ROTATING SAID MEMBERS IN THE SAME DIRECTION, AND THE FLANKS OF EACH OF SAID MEMBERS BEING SUBSTANTIALLY GENERATED BY PORTIONS OF THE CRESTS OF THE OTHER MEMBER, WHEREBY THE CREASTS OF EACH OF SAID MEMBERS WIPES THE WALLS OF ITS ASSOCIATED CYLINDER AND THE FLANKS OF EACH OF SAID MEMBERS IS WIPED BY PORTIONS OF THE CRESTS OF THE OTHER MEMBER. 